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sys/netipsec/ipsec_output.c
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1 /*- 2 * Copyright (c) 2002, 2003 Sam Leffler, Errno Consulting 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD: releng/9.2/sys/netipsec/ipsec_output.c 252693 2013-07-04 08:59:34Z ae $ 27 */ 28 29 /* 30 * IPsec output processing. 31 */ 32 #include "opt_inet.h" 33 #include "opt_inet6.h" 34 #include "opt_ipsec.h" 35 #include "opt_enc.h" 36 37 #include <sys/param.h> 38 #include <sys/systm.h> 39 #include <sys/mbuf.h> 40 #include <sys/domain.h> 41 #include <sys/protosw.h> 42 #include <sys/socket.h> 43 #include <sys/errno.h> 44 #include <sys/syslog.h> 45 46 #include <net/if.h> 47 #include <net/pfil.h> 48 #include <net/route.h> 49 #include <net/vnet.h> 50 51 #include <netinet/in.h> 52 #include <netinet/in_systm.h> 53 #include <netinet/ip.h> 54 #include <netinet/ip_var.h> 55 #include <netinet/in_var.h> 56 #include <netinet/ip_ecn.h> 57 #ifdef INET6 58 #include <netinet6/ip6_ecn.h> 59 #endif 60 61 #include <netinet/ip6.h> 62 #ifdef INET6 63 #include <netinet6/ip6_var.h> 64 #endif 65 #include <netinet/in_pcb.h> 66 #ifdef INET6 67 #include <netinet/icmp6.h> 68 #endif 69 70 #include <netipsec/ipsec.h> 71 #ifdef INET6 72 #include <netipsec/ipsec6.h> 73 #endif 74 #include <netipsec/ah_var.h> 75 #include <netipsec/esp_var.h> 76 #include <netipsec/ipcomp_var.h> 77 78 #include <netipsec/xform.h> 79 80 #include <netipsec/key.h> 81 #include <netipsec/keydb.h> 82 #include <netipsec/key_debug.h> 83 84 #include <machine/in_cksum.h> 85 86 #ifdef IPSEC_NAT_T 87 #include <netinet/udp.h> 88 #endif 89 90 #ifdef DEV_ENC 91 #include <net/if_enc.h> 92 #endif 93 94 95 int 96 ipsec_process_done(struct mbuf *m, struct ipsecrequest *isr) 97 { 98 struct tdb_ident *tdbi; 99 struct m_tag *mtag; 100 struct secasvar *sav; 101 struct secasindex *saidx; 102 int error; 103 104 IPSEC_ASSERT(m != NULL, ("null mbuf")); 105 IPSEC_ASSERT(isr != NULL, ("null ISR")); 106 sav = isr->sav; 107 IPSEC_ASSERT(sav != NULL, ("null SA")); 108 IPSEC_ASSERT(sav->sah != NULL, ("null SAH")); 109 110 saidx = &sav->sah->saidx; 111 switch (saidx->dst.sa.sa_family) { 112 #ifdef INET 113 case AF_INET: 114 /* Fix the header length, for AH processing. */ 115 mtod(m, struct ip *)->ip_len = htons(m->m_pkthdr.len); 116 break; 117 #endif /* INET */ 118 #ifdef INET6 119 case AF_INET6: 120 /* Fix the header length, for AH processing. */ 121 if (m->m_pkthdr.len < sizeof (struct ip6_hdr)) { 122 error = ENXIO; 123 goto bad; 124 } 125 if (m->m_pkthdr.len - sizeof (struct ip6_hdr) > IPV6_MAXPACKET) { 126 /* No jumbogram support. */ 127 error = ENXIO; /*?*/ 128 goto bad; 129 } 130 mtod(m, struct ip6_hdr *)->ip6_plen = 131 htons(m->m_pkthdr.len - sizeof(struct ip6_hdr)); 132 break; 133 #endif /* INET6 */ 134 default: 135 DPRINTF(("%s: unknown protocol family %u\n", __func__, 136 saidx->dst.sa.sa_family)); 137 error = ENXIO; 138 goto bad; 139 } 140 141 /* 142 * Add a record of what we've done or what needs to be done to the 143 * packet. 144 */ 145 mtag = m_tag_get(PACKET_TAG_IPSEC_OUT_DONE, 146 sizeof(struct tdb_ident), M_NOWAIT); 147 if (mtag == NULL) { 148 DPRINTF(("%s: could not get packet tag\n", __func__)); 149 error = ENOMEM; 150 goto bad; 151 } 152 153 tdbi = (struct tdb_ident *)(mtag + 1); 154 tdbi->dst = saidx->dst; 155 tdbi->proto = saidx->proto; 156 tdbi->spi = sav->spi; 157 m_tag_prepend(m, mtag); 158 159 /* 160 * If there's another (bundled) SA to apply, do so. 161 * Note that this puts a burden on the kernel stack size. 162 * If this is a problem we'll need to introduce a queue 163 * to set the packet on so we can unwind the stack before 164 * doing further processing. 165 */ 166 if (isr->next) { 167 IPSECSTAT_INC(ips_out_bundlesa); 168 /* XXX-BZ currently only support same AF bundles. */ 169 switch (saidx->dst.sa.sa_family) { 170 #ifdef INET 171 case AF_INET: 172 return ipsec4_process_packet(m, isr->next, 0, 0); 173 /* NOTREACHED */ 174 #endif 175 #ifdef notyet 176 #ifdef INET6 177 case AF_INET6: 178 /* XXX */ 179 ipsec6_output_trans() 180 ipsec6_output_tunnel() 181 /* NOTREACHED */ 182 #endif /* INET6 */ 183 #endif 184 default: 185 DPRINTF(("%s: unknown protocol family %u\n", __func__, 186 saidx->dst.sa.sa_family)); 187 error = ENXIO; 188 goto bad; 189 } 190 } 191 key_sa_recordxfer(sav, m); /* record data transfer */ 192 193 m_addr_changed(m); 194 195 /* 196 * We're done with IPsec processing, transmit the packet using the 197 * appropriate network protocol (IP or IPv6). SPD lookup will be 198 * performed again there. 199 */ 200 switch (saidx->dst.sa.sa_family) { 201 #ifdef INET 202 struct ip *ip; 203 case AF_INET: 204 ip = mtod(m, struct ip *); 205 ip->ip_len = ntohs(ip->ip_len); 206 ip->ip_off = ntohs(ip->ip_off); 207 208 #ifdef IPSEC_NAT_T 209 /* 210 * If NAT-T is enabled, now that all IPsec processing is done 211 * insert UDP encapsulation header after IP header. 212 */ 213 if (sav->natt_type) { 214 #ifdef _IP_VHL 215 const int hlen = IP_VHL_HL(ip->ip_vhl); 216 #else 217 const int hlen = (ip->ip_hl << 2); 218 #endif 219 int size, off; 220 struct mbuf *mi; 221 struct udphdr *udp; 222 223 size = sizeof(struct udphdr); 224 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) { 225 /* 226 * draft-ietf-ipsec-nat-t-ike-0[01].txt and 227 * draft-ietf-ipsec-udp-encaps-(00/)01.txt, 228 * ignoring possible AH mode 229 * non-IKE marker + non-ESP marker 230 * from draft-ietf-ipsec-udp-encaps-00.txt. 231 */ 232 size += sizeof(u_int64_t); 233 } 234 mi = m_makespace(m, hlen, size, &off); 235 if (mi == NULL) { 236 DPRINTF(("%s: m_makespace for udphdr failed\n", 237 __func__)); 238 error = ENOBUFS; 239 goto bad; 240 } 241 242 udp = (struct udphdr *)(mtod(mi, caddr_t) + off); 243 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 244 udp->uh_sport = htons(UDP_ENCAP_ESPINUDP_PORT); 245 else 246 udp->uh_sport = 247 KEY_PORTFROMSADDR(&sav->sah->saidx.src); 248 udp->uh_dport = KEY_PORTFROMSADDR(&sav->sah->saidx.dst); 249 udp->uh_sum = 0; 250 udp->uh_ulen = htons(m->m_pkthdr.len - hlen); 251 ip->ip_len = m->m_pkthdr.len; 252 ip->ip_p = IPPROTO_UDP; 253 254 if (sav->natt_type == UDP_ENCAP_ESPINUDP_NON_IKE) 255 *(u_int64_t *)(udp + 1) = 0; 256 } 257 #endif /* IPSEC_NAT_T */ 258 259 return ip_output(m, NULL, NULL, IP_RAWOUTPUT, NULL, NULL); 260 #endif /* INET */ 261 #ifdef INET6 262 case AF_INET6: 263 /* 264 * We don't need massage, IPv6 header fields are always in 265 * net endian. 266 */ 267 return ip6_output(m, NULL, NULL, 0, NULL, NULL, NULL); 268 #endif /* INET6 */ 269 } 270 panic("ipsec_process_done"); 271 bad: 272 m_freem(m); 273 return (error); 274 } 275 276 static struct ipsecrequest * 277 ipsec_nextisr( 278 struct mbuf *m, 279 struct ipsecrequest *isr, 280 int af, 281 struct secasindex *saidx, 282 int *error 283 ) 284 { 285 #define IPSEC_OSTAT(name) do { \ 286 if (isr->saidx.proto == IPPROTO_ESP) \ 287 ESPSTAT_INC(esps_##name); \ 288 else if (isr->saidx.proto == IPPROTO_AH)\ 289 AHSTAT_INC(ahs_##name); \ 290 else \ 291 IPCOMPSTAT_INC(ipcomps_##name); \ 292 } while (0) 293 struct secasvar *sav; 294 295 IPSECREQUEST_LOCK_ASSERT(isr); 296 297 IPSEC_ASSERT(af == AF_INET || af == AF_INET6, 298 ("invalid address family %u", af)); 299 again: 300 /* 301 * Craft SA index to search for proper SA. Note that 302 * we only fillin unspecified SA peers for transport 303 * mode; for tunnel mode they must already be filled in. 304 */ 305 *saidx = isr->saidx; 306 if (isr->saidx.mode == IPSEC_MODE_TRANSPORT) { 307 /* Fillin unspecified SA peers only for transport mode */ 308 if (af == AF_INET) { 309 struct sockaddr_in *sin; 310 struct ip *ip = mtod(m, struct ip *); 311 312 if (saidx->src.sa.sa_len == 0) { 313 sin = &saidx->src.sin; 314 sin->sin_len = sizeof(*sin); 315 sin->sin_family = AF_INET; 316 sin->sin_port = IPSEC_PORT_ANY; 317 sin->sin_addr = ip->ip_src; 318 } 319 if (saidx->dst.sa.sa_len == 0) { 320 sin = &saidx->dst.sin; 321 sin->sin_len = sizeof(*sin); 322 sin->sin_family = AF_INET; 323 sin->sin_port = IPSEC_PORT_ANY; 324 sin->sin_addr = ip->ip_dst; 325 } 326 } else { 327 struct sockaddr_in6 *sin6; 328 struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *); 329 330 if (saidx->src.sin6.sin6_len == 0) { 331 sin6 = (struct sockaddr_in6 *)&saidx->src; 332 sin6->sin6_len = sizeof(*sin6); 333 sin6->sin6_family = AF_INET6; 334 sin6->sin6_port = IPSEC_PORT_ANY; 335 sin6->sin6_addr = ip6->ip6_src; 336 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_src)) { 337 /* fix scope id for comparing SPD */ 338 sin6->sin6_addr.s6_addr16[1] = 0; 339 sin6->sin6_scope_id = 340 ntohs(ip6->ip6_src.s6_addr16[1]); 341 } 342 } 343 if (saidx->dst.sin6.sin6_len == 0) { 344 sin6 = (struct sockaddr_in6 *)&saidx->dst; 345 sin6->sin6_len = sizeof(*sin6); 346 sin6->sin6_family = AF_INET6; 347 sin6->sin6_port = IPSEC_PORT_ANY; 348 sin6->sin6_addr = ip6->ip6_dst; 349 if (IN6_IS_SCOPE_LINKLOCAL(&ip6->ip6_dst)) { 350 /* fix scope id for comparing SPD */ 351 sin6->sin6_addr.s6_addr16[1] = 0; 352 sin6->sin6_scope_id = 353 ntohs(ip6->ip6_dst.s6_addr16[1]); 354 } 355 } 356 } 357 } 358 359 /* 360 * Lookup SA and validate it. 361 */ 362 *error = key_checkrequest(isr, saidx); 363 if (*error != 0) { 364 /* 365 * IPsec processing is required, but no SA found. 366 * I assume that key_acquire() had been called 367 * to get/establish the SA. Here I discard 368 * this packet because it is responsibility for 369 * upper layer to retransmit the packet. 370 */ 371 IPSECSTAT_INC(ips_out_nosa); 372 goto bad; 373 } 374 sav = isr->sav; 375 if (sav == NULL) { 376 IPSEC_ASSERT(ipsec_get_reqlevel(isr) == IPSEC_LEVEL_USE, 377 ("no SA found, but required; level %u", 378 ipsec_get_reqlevel(isr))); 379 IPSECREQUEST_UNLOCK(isr); 380 isr = isr->next; 381 /* 382 * If isr is NULL, we found a 'use' policy w/o SA. 383 * Return w/o error and w/o isr so we can drop out 384 * and continue w/o IPsec processing. 385 */ 386 if (isr == NULL) 387 return isr; 388 IPSECREQUEST_LOCK(isr); 389 goto again; 390 } 391 392 /* 393 * Check system global policy controls. 394 */ 395 if ((isr->saidx.proto == IPPROTO_ESP && !V_esp_enable) || 396 (isr->saidx.proto == IPPROTO_AH && !V_ah_enable) || 397 (isr->saidx.proto == IPPROTO_IPCOMP && !V_ipcomp_enable)) { 398 DPRINTF(("%s: IPsec outbound packet dropped due" 399 " to policy (check your sysctls)\n", __func__)); 400 IPSEC_OSTAT(pdrops); 401 *error = EHOSTUNREACH; 402 goto bad; 403 } 404 405 /* 406 * Sanity check the SA contents for the caller 407 * before they invoke the xform output method. 408 */ 409 if (sav->tdb_xform == NULL) { 410 DPRINTF(("%s: no transform for SA\n", __func__)); 411 IPSEC_OSTAT(noxform); 412 *error = EHOSTUNREACH; 413 goto bad; 414 } 415 return isr; 416 bad: 417 IPSEC_ASSERT(*error != 0, ("error return w/ no error code")); 418 IPSECREQUEST_UNLOCK(isr); 419 return NULL; 420 #undef IPSEC_OSTAT 421 } 422 423 #ifdef INET 424 /* 425 * IPsec output logic for IPv4. 426 */ 427 int 428 ipsec4_process_packet( 429 struct mbuf *m, 430 struct ipsecrequest *isr, 431 int flags, 432 int tunalready) 433 { 434 struct secasindex saidx; 435 struct secasvar *sav; 436 struct ip *ip; 437 int error, i, off; 438 439 IPSEC_ASSERT(m != NULL, ("null mbuf")); 440 IPSEC_ASSERT(isr != NULL, ("null isr")); 441 442 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 443 444 isr = ipsec_nextisr(m, isr, AF_INET, &saidx, &error); 445 if (isr == NULL) { 446 if (error != 0) 447 goto bad; 448 return EJUSTRETURN; 449 } 450 451 sav = isr->sav; 452 453 #ifdef DEV_ENC 454 encif->if_opackets++; 455 encif->if_obytes += m->m_pkthdr.len; 456 457 /* pass the mbuf to enc0 for bpf processing */ 458 ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_BEFORE); 459 /* pass the mbuf to enc0 for packet filtering */ 460 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 461 goto bad; 462 #endif 463 464 if (!tunalready) { 465 union sockaddr_union *dst = &sav->sah->saidx.dst; 466 int setdf; 467 468 /* 469 * Collect IP_DF state from the outer header. 470 */ 471 if (dst->sa.sa_family == AF_INET) { 472 if (m->m_len < sizeof (struct ip) && 473 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 474 error = ENOBUFS; 475 goto bad; 476 } 477 ip = mtod(m, struct ip *); 478 /* Honor system-wide control of how to handle IP_DF */ 479 switch (V_ip4_ipsec_dfbit) { 480 case 0: /* clear in outer header */ 481 case 1: /* set in outer header */ 482 setdf = V_ip4_ipsec_dfbit; 483 break; 484 default: /* propagate to outer header */ 485 setdf = ntohs(ip->ip_off & IP_DF); 486 break; 487 } 488 } else { 489 ip = NULL; /* keep compiler happy */ 490 setdf = 0; 491 } 492 /* Do the appropriate encapsulation, if necessary */ 493 if (isr->saidx.mode == IPSEC_MODE_TUNNEL || /* Tunnel requ'd */ 494 dst->sa.sa_family != AF_INET || /* PF mismatch */ 495 #if 0 496 (sav->flags & SADB_X_SAFLAGS_TUNNEL) || /* Tunnel requ'd */ 497 sav->tdb_xform->xf_type == XF_IP4 || /* ditto */ 498 #endif 499 (dst->sa.sa_family == AF_INET && /* Proxy */ 500 dst->sin.sin_addr.s_addr != INADDR_ANY && 501 dst->sin.sin_addr.s_addr != ip->ip_dst.s_addr)) { 502 struct mbuf *mp; 503 504 /* Fix IPv4 header checksum and length */ 505 if (m->m_len < sizeof (struct ip) && 506 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 507 error = ENOBUFS; 508 goto bad; 509 } 510 ip = mtod(m, struct ip *); 511 ip->ip_len = htons(m->m_pkthdr.len); 512 ip->ip_sum = 0; 513 #ifdef _IP_VHL 514 if (ip->ip_vhl == IP_VHL_BORING) 515 ip->ip_sum = in_cksum_hdr(ip); 516 else 517 ip->ip_sum = in_cksum(m, 518 _IP_VHL_HL(ip->ip_vhl) << 2); 519 #else 520 ip->ip_sum = in_cksum(m, ip->ip_hl << 2); 521 #endif 522 523 /* Encapsulate the packet */ 524 error = ipip_output(m, isr, &mp, 0, 0); 525 if (mp == NULL && !error) { 526 /* Should never happen. */ 527 DPRINTF(("%s: ipip_output returns no mbuf and " 528 "no error!", __func__)); 529 error = EFAULT; 530 } 531 if (error) { 532 if (mp) { 533 /* XXX: Should never happen! */ 534 m_freem(mp); 535 } 536 m = NULL; /* ipip_output() already freed it */ 537 goto bad; 538 } 539 m = mp, mp = NULL; 540 /* 541 * ipip_output clears IP_DF in the new header. If 542 * we need to propagate IP_DF from the outer header, 543 * then we have to do it here. 544 * 545 * XXX shouldn't assume what ipip_output does. 546 */ 547 if (dst->sa.sa_family == AF_INET && setdf) { 548 if (m->m_len < sizeof (struct ip) && 549 (m = m_pullup(m, sizeof (struct ip))) == NULL) { 550 error = ENOBUFS; 551 goto bad; 552 } 553 ip = mtod(m, struct ip *); 554 ip->ip_off = ntohs(ip->ip_off); 555 ip->ip_off |= IP_DF; 556 ip->ip_off = htons(ip->ip_off); 557 } 558 } 559 } 560 561 #ifdef DEV_ENC 562 /* pass the mbuf to enc0 for bpf processing */ 563 ipsec_bpf(m, sav, AF_INET, ENC_OUT|ENC_AFTER); 564 /* pass the mbuf to enc0 for packet filtering */ 565 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 566 goto bad; 567 #endif 568 569 /* 570 * Dispatch to the appropriate IPsec transform logic. The 571 * packet will be returned for transmission after crypto 572 * processing, etc. are completed. For encapsulation we 573 * bypass this call because of the explicit call done above 574 * (necessary to deal with IP_DF handling for IPv4). 575 * 576 * NB: m & sav are ``passed to caller'' who's reponsible for 577 * for reclaiming their resources. 578 */ 579 if (sav->tdb_xform->xf_type != XF_IP4) { 580 ip = mtod(m, struct ip *); 581 i = ip->ip_hl << 2; 582 off = offsetof(struct ip, ip_p); 583 error = (*sav->tdb_xform->xf_output)(m, isr, NULL, i, off); 584 } else { 585 error = ipsec_process_done(m, isr); 586 } 587 IPSECREQUEST_UNLOCK(isr); 588 return error; 589 bad: 590 if (isr) 591 IPSECREQUEST_UNLOCK(isr); 592 if (m) 593 m_freem(m); 594 return error; 595 } 596 #endif 597 598 #ifdef INET6 599 /* 600 * Chop IP6 header from the payload. 601 */ 602 static struct mbuf * 603 ipsec6_splithdr(struct mbuf *m) 604 { 605 struct mbuf *mh; 606 struct ip6_hdr *ip6; 607 int hlen; 608 609 IPSEC_ASSERT(m->m_len >= sizeof (struct ip6_hdr), 610 ("first mbuf too short, len %u", m->m_len)); 611 ip6 = mtod(m, struct ip6_hdr *); 612 hlen = sizeof(struct ip6_hdr); 613 if (m->m_len > hlen) { 614 MGETHDR(mh, M_DONTWAIT, MT_DATA); 615 if (!mh) { 616 m_freem(m); 617 return NULL; 618 } 619 M_MOVE_PKTHDR(mh, m); 620 MH_ALIGN(mh, hlen); 621 m->m_len -= hlen; 622 m->m_data += hlen; 623 mh->m_next = m; 624 m = mh; 625 m->m_len = hlen; 626 bcopy((caddr_t)ip6, mtod(m, caddr_t), hlen); 627 } else if (m->m_len < hlen) { 628 m = m_pullup(m, hlen); 629 if (!m) 630 return NULL; 631 } 632 return m; 633 } 634 635 /* 636 * IPsec output logic for IPv6, transport mode. 637 */ 638 int 639 ipsec6_output_trans( 640 struct ipsec_output_state *state, 641 u_char *nexthdrp, 642 struct mbuf *mprev, 643 struct secpolicy *sp, 644 int flags, 645 int *tun) 646 { 647 struct ipsecrequest *isr; 648 struct secasindex saidx; 649 int error = 0; 650 struct mbuf *m; 651 652 IPSEC_ASSERT(state != NULL, ("null state")); 653 IPSEC_ASSERT(state->m != NULL, ("null m")); 654 IPSEC_ASSERT(nexthdrp != NULL, ("null nexthdrp")); 655 IPSEC_ASSERT(mprev != NULL, ("null mprev")); 656 IPSEC_ASSERT(sp != NULL, ("null sp")); 657 IPSEC_ASSERT(tun != NULL, ("null tun")); 658 659 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 660 printf("%s: applied SP\n", __func__); 661 kdebug_secpolicy(sp)); 662 663 isr = sp->req; 664 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 665 /* the rest will be handled by ipsec6_output_tunnel() */ 666 *tun = 1; /* need tunnel-mode processing */ 667 return 0; 668 } 669 670 *tun = 0; 671 m = state->m; 672 673 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 674 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 675 if (isr == NULL) { 676 if (error != 0) { 677 #ifdef notdef 678 /* XXX should notification be done for all errors ? */ 679 /* 680 * Notify the fact that the packet is discarded 681 * to ourselves. I believe this is better than 682 * just silently discarding. (jinmei@kame.net) 683 * XXX: should we restrict the error to TCP packets? 684 * XXX: should we directly notify sockets via 685 * pfctlinputs? 686 */ 687 icmp6_error(m, ICMP6_DST_UNREACH, 688 ICMP6_DST_UNREACH_ADMIN, 0); 689 m = NULL; /* NB: icmp6_error frees mbuf */ 690 #endif 691 goto bad; 692 } 693 return EJUSTRETURN; 694 } 695 696 error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 697 sizeof (struct ip6_hdr), 698 offsetof(struct ip6_hdr, 699 ip6_nxt)); 700 IPSECREQUEST_UNLOCK(isr); 701 return error; 702 bad: 703 if (isr) 704 IPSECREQUEST_UNLOCK(isr); 705 if (m) 706 m_freem(m); 707 state->m = NULL; 708 return error; 709 } 710 711 static int 712 ipsec6_encapsulate(struct mbuf *m, struct secasvar *sav) 713 { 714 struct ip6_hdr *oip6; 715 struct ip6_hdr *ip6; 716 size_t plen; 717 718 /* can't tunnel between different AFs */ 719 if (sav->sah->saidx.src.sa.sa_family != AF_INET6 || 720 sav->sah->saidx.dst.sa.sa_family != AF_INET6) { 721 m_freem(m); 722 return EINVAL; 723 } 724 IPSEC_ASSERT(m->m_len == sizeof (struct ip6_hdr), 725 ("mbuf wrong size; len %u", m->m_len)); 726 727 728 /* 729 * grow the mbuf to accomodate the new IPv6 header. 730 */ 731 plen = m->m_pkthdr.len; 732 if (M_LEADINGSPACE(m->m_next) < sizeof(struct ip6_hdr)) { 733 struct mbuf *n; 734 MGET(n, M_DONTWAIT, MT_DATA); 735 if (!n) { 736 m_freem(m); 737 return ENOBUFS; 738 } 739 n->m_len = sizeof(struct ip6_hdr); 740 n->m_next = m->m_next; 741 m->m_next = n; 742 m->m_pkthdr.len += sizeof(struct ip6_hdr); 743 oip6 = mtod(n, struct ip6_hdr *); 744 } else { 745 m->m_next->m_len += sizeof(struct ip6_hdr); 746 m->m_next->m_data -= sizeof(struct ip6_hdr); 747 m->m_pkthdr.len += sizeof(struct ip6_hdr); 748 oip6 = mtod(m->m_next, struct ip6_hdr *); 749 } 750 ip6 = mtod(m, struct ip6_hdr *); 751 bcopy((caddr_t)ip6, (caddr_t)oip6, sizeof(struct ip6_hdr)); 752 753 /* Fake link-local scope-class addresses */ 754 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_src)) 755 oip6->ip6_src.s6_addr16[1] = 0; 756 if (IN6_IS_SCOPE_LINKLOCAL(&oip6->ip6_dst)) 757 oip6->ip6_dst.s6_addr16[1] = 0; 758 759 /* construct new IPv6 header. see RFC 2401 5.1.2.2 */ 760 /* ECN consideration. */ 761 ip6_ecn_ingress(V_ip6_ipsec_ecn, &ip6->ip6_flow, &oip6->ip6_flow); 762 if (plen < IPV6_MAXPACKET - sizeof(struct ip6_hdr)) 763 ip6->ip6_plen = htons(plen); 764 else { 765 /* ip6->ip6_plen will be updated in ip6_output() */ 766 } 767 ip6->ip6_nxt = IPPROTO_IPV6; 768 ip6->ip6_src = sav->sah->saidx.src.sin6.sin6_addr; 769 ip6->ip6_dst = sav->sah->saidx.dst.sin6.sin6_addr; 770 ip6->ip6_hlim = IPV6_DEFHLIM; 771 772 /* XXX Should ip6_src be updated later ? */ 773 774 return 0; 775 } 776 777 /* 778 * IPsec output logic for IPv6, tunnel mode. 779 */ 780 int 781 ipsec6_output_tunnel(struct ipsec_output_state *state, struct secpolicy *sp, int flags) 782 { 783 struct ip6_hdr *ip6; 784 struct ipsecrequest *isr; 785 struct secasindex saidx; 786 int error; 787 struct sockaddr_in6 *dst6; 788 struct mbuf *m; 789 790 IPSEC_ASSERT(state != NULL, ("null state")); 791 IPSEC_ASSERT(state->m != NULL, ("null m")); 792 IPSEC_ASSERT(sp != NULL, ("null sp")); 793 794 KEYDEBUG(KEYDEBUG_IPSEC_DATA, 795 printf("%s: applied SP\n", __func__); 796 kdebug_secpolicy(sp)); 797 798 m = state->m; 799 /* 800 * transport mode ipsec (before the 1st tunnel mode) is already 801 * processed by ipsec6_output_trans(). 802 */ 803 for (isr = sp->req; isr; isr = isr->next) { 804 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) 805 break; 806 } 807 808 IPSECREQUEST_LOCK(isr); /* insure SA contents don't change */ 809 isr = ipsec_nextisr(m, isr, AF_INET6, &saidx, &error); 810 if (isr == NULL) { 811 if (error != 0) 812 goto bad; 813 return EJUSTRETURN; 814 } 815 816 #ifdef DEV_ENC 817 encif->if_opackets++; 818 encif->if_obytes += m->m_pkthdr.len; 819 820 /* pass the mbuf to enc0 for bpf processing */ 821 ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_BEFORE); 822 /* pass the mbuf to enc0 for packet filtering */ 823 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_BEFORE)) != 0) 824 goto bad; 825 #endif 826 827 /* 828 * There may be the case that SA status will be changed when 829 * we are refering to one. So calling splsoftnet(). 830 */ 831 if (isr->saidx.mode == IPSEC_MODE_TUNNEL) { 832 /* 833 * build IPsec tunnel. 834 */ 835 /* XXX should be processed with other familiy */ 836 if (isr->sav->sah->saidx.src.sa.sa_family != AF_INET6) { 837 ipseclog((LOG_ERR, "%s: family mismatched between " 838 "inner and outer, spi=%u\n", __func__, 839 ntohl(isr->sav->spi))); 840 IPSEC6STAT_INC(ips_out_inval); 841 error = EAFNOSUPPORT; 842 goto bad; 843 } 844 845 m = ipsec6_splithdr(m); 846 if (!m) { 847 IPSEC6STAT_INC(ips_out_nomem); 848 error = ENOMEM; 849 goto bad; 850 } 851 error = ipsec6_encapsulate(m, isr->sav); 852 if (error) { 853 m = NULL; 854 goto bad; 855 } 856 ip6 = mtod(m, struct ip6_hdr *); 857 858 state->ro = 859 (struct route *)&isr->sav->sah->route_cache.sin6_route; 860 state->dst = (struct sockaddr *)&state->ro->ro_dst; 861 dst6 = (struct sockaddr_in6 *)state->dst; 862 if (state->ro->ro_rt 863 && ((state->ro->ro_rt->rt_flags & RTF_UP) == 0 864 || !IN6_ARE_ADDR_EQUAL(&dst6->sin6_addr, &ip6->ip6_dst))) { 865 RTFREE(state->ro->ro_rt); 866 state->ro->ro_rt = NULL; 867 } 868 if (state->ro->ro_rt == NULL) { 869 bzero(dst6, sizeof(*dst6)); 870 dst6->sin6_family = AF_INET6; 871 dst6->sin6_len = sizeof(*dst6); 872 dst6->sin6_addr = ip6->ip6_dst; 873 rtalloc_ign_fib(state->ro, 0UL, M_GETFIB(m)); 874 } 875 if (state->ro->ro_rt == NULL) { 876 IP6STAT_INC(ip6s_noroute); 877 IPSEC6STAT_INC(ips_out_noroute); 878 error = EHOSTUNREACH; 879 goto bad; 880 } 881 882 /* adjust state->dst if tunnel endpoint is offlink */ 883 if (state->ro->ro_rt->rt_flags & RTF_GATEWAY) 884 state->dst = (struct sockaddr *)state->ro->ro_rt->rt_gateway; 885 } 886 887 m = ipsec6_splithdr(m); 888 if (!m) { 889 IPSEC6STAT_INC(ips_out_nomem); 890 error = ENOMEM; 891 goto bad; 892 } 893 ip6 = mtod(m, struct ip6_hdr *); 894 895 #ifdef DEV_ENC 896 /* pass the mbuf to enc0 for bpf processing */ 897 ipsec_bpf(m, isr->sav, AF_INET6, ENC_OUT|ENC_AFTER); 898 /* pass the mbuf to enc0 for packet filtering */ 899 if ((error = ipsec_filter(&m, PFIL_OUT, ENC_OUT|ENC_AFTER)) != 0) 900 goto bad; 901 #endif 902 903 error = (*isr->sav->tdb_xform->xf_output)(m, isr, NULL, 904 sizeof (struct ip6_hdr), 905 offsetof(struct ip6_hdr, ip6_nxt)); 906 IPSECREQUEST_UNLOCK(isr); 907 return error; 908 bad: 909 if (isr) 910 IPSECREQUEST_UNLOCK(isr); 911 if (m) 912 m_freem(m); 913 state->m = NULL; 914 return error; 915 } 916 #endif /*INET6*/
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